Fall 2012 mid-marsh and creekbank survey of adult and recruit Littoraria irrorata abundance at GCE LTER sampling sites 1-10

The abundance of Littoraria irrorata was investigated at ten sampling sites within the Georgia Coastal Ecosystem (GCE) LTER study area in October 2012. Visual counts of adult Littoraria were conducted within 0.5m x 0.5m creekbank and mid-marsh quadrats in line with permanent GCE vegetation plots. "Recruit" Littoraria (1-4 mm shell length) were found and counted by looking inside all leaf furls within a nested quadrat (0.25m x 0.25m). This method is a new part of the annual GCE monitoring starting in 2012, and supplements the invertebrate data that has been collected since October 2000.

2012年10月，研究团队于佐治亚海岸生态系统（Georgia Coastal Ecosystem, GCE）长期生态研究（Long-Term Ecological Research, LTER）区域内的10个采样点位，开展了粗糙滨螺（Littoraria irrorata）种群丰度调查。依照GCE永久植被样地的布设标准，研究人员在0.5m×0.5m的溪岸及盐沼中部样方内，对成体粗糙滨螺开展目视计数工作。针对壳长1~4mm的"幼体"粗糙滨螺，研究人员采用嵌套样方法完成调查：在0.25m×0.25m的嵌套样方中，逐一排查所有植物叶鞘褶皱内部，以此统计幼体数量。该调查方法为2012年起新增的GCE年度监测内容，用于补充自2000年10月起持续收集的无脊椎动物监测数据。